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PUBLIC HEALTH ASSESSMENT

LAIDLAW ENVIRONMENTAL SERVICES (TOC), INCORPORATED
ROEBUCK, SOUTH CAROLINA


CONCLUSIONS

Based on the information available to and reviewed by this agency, ATSDR concludes that the Laidlaw Environmental Services (TOC) site in Roebuck, South Carolina, currently poses no apparent public health hazard.

Specifically:

  • Adverse health effects, including cancer, would not be associated with inhalation exposures to contaminants detected in air at Roebuck, South Carolina.
  • Due to the absence of air monitoring data prior to 1986, ATSDR is unable to evaluate the public health implications of air contamination at this site prior to 1986.
  • As far as ATSDR has been able to determine, no one is using contaminated groundwater as a source of drinking water. Measures should be taken to assure that this remains the case, at least until current remediation efforts are effectively completed, because the levels of contamination indicated by the data would be hazardous to the health of persons who drank this water.
  • Based on past pond water data, the occasional, brief exposures that workers had to pond water in the past are not likely to have represented a toxic hazard.
  • No volatile organic compound (VOC) contamination was detected in stream water or sediments during recent sampling. Recent sediment sampling data indicated a few metals that would not be expected to result in adverse health effects now or in the future.
  • Potential exposures to contaminants in on-site soils pose no hazard to public health because 1) access to on-site soils is limited and 2) the levels of contamination are relatively low.
  • The first incinerator had the potential for release and deposition of dioxins in the past and the community is concerned about dioxin exposure.

RECOMMENDATIONS AND ACTIONS

A. Recommendations

1. Sample for dioxin in surface soil at the site perimeter.

2. Continue groundwater monitoring of the contaminant plumes. In the event that monitoring wells located outside of Laidlaw's facility line indicate either the volatile organic compound (VOC) or Salt plume are migrating toward private wells, sample nearby private wells.

3. Efforts should be made to prevent human exposure to contaminated groundwater, including institutional controls on the installation of wells in areas of known groundwater contamination.

4. Continue remediation of the VOC groundwater plume as described in the Corrective Measures Study.

B. Public Health Action Plan

The actions described in this section are designed to ensure that this public health assessment identifies public health hazards and provides a plan of action to mitigate and prevent adverse health effects resulting from exposure to hazardous substances in the environment.

The first incinerator used at the site during ABCO's ownership of the facility may have released dioxin. SCDHEC is working with EPA to obtain a dioxin soil sample from the perimeter of the site.

Groundwater beneath the site is contaminated. Laidlaw Environmental Services (TOC), Inc. is responsible for continued monitoring of the groundwater plumes with technical oversight by SCDHEC. Laidlaw is also responsible for remediating the VOC plume. SCDHEC is considering the placement of institutional controls on the installation of drinking water wells in the area.

Laidlaw is responsible for activities described in the Closure Plan for the site.


PREPARERS OF REPORT

Danielle M. Langmann, MS
Environmental Health Scientist
Petition Response Section
Exposure Investigation and Consultation Branch
Division of Health Assessment and Consultation

Frank C. Schnell, PhD, DABT
Toxicologist
Petition Response Section
Exposure Investigation and Consultation Branch
Division of Health Assessment and Consultation

Adele M. Childress, PhD, MSPH
Environmental Health Scientist
Petition Response Section
Exposure Investigation and Consultation Branch
Division of Health Assessment and Consultation


ATSDR Regional Representative:

Robert Safay
Senior Regional Representative
Region IV


REFERENCES

  1. ABCO Industries, Inc. April 28, 1980. Wastewater analysis, letter from David Dempsey to Robert Gross.

  2. ABCO Chemicals, Inc. September 29, 1980. Analytical Report, Roebuck, South Carolina.

  3. ABCO Industries, Inc. July 15, 1981. Re: Pasture Irrigation with Woods Pond Water, Letter from David Dempsey to Andy Yasinsac.

  4. Dames & Moore; Hydroscience, Inc. January 2, 1991. RCRA Facility Investigation, Laidlaw Environmental Services (TOC), Roebuck, South Carolina.

  5. Hydroscience, Inc. February 1990. Groundwater Quality Assessment Report 1989, Thermal Oxidation Corporation, Roebuck, South Carolina.

  6. Hydroscience, Inc. February 1991. Groundwater Quality Assessment Report 1990, Laidlaw Environmental Services (TOC), Inc., Roebuck, South Carolina.

  7. Hydroscience, Inc. February 1992. Groundwater Quality Assessment Report 1991, Laidlaw Environmental Services (TOC), Inc., Roebuck, South Carolina.

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  9. RMT/Hydroscience, Inc. February 1993. Groundwater Quality Assessment Report 1992, Laidlaw Environmental Services (TOC), Inc., Roebuck, South Carolina.

  10. RMT/Hydroscience, Inc. February 1994. Groundwater Quality Assessment Report 1993, Laidlaw Environmental Services (TOC), Inc., Roebuck, South Carolina.

  11. RMT/Hydroscience, Inc. February 1995. Groundwater Quality Assessment Report 1994, Laidlaw Environmental Services (TOC), Inc., Roebuck, South Carolina.

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